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Parser util class qualified name, most likely GeneratedParserUtilBase (default) or its subclass.

<h2>Examples:</h2>
<pre><code>
  {
    parserUtilClass="org.intellij.grammar.parser.GrammarParserUtil"
  }

  // parseGrammar reference here resolves to
  //   GrammarParserUtil#parseGrammar(PsiBuilder builder, int level)
  external grammar ::= parseGrammar grammar_element

  // alternative syntax using external expression
  grammar ::= &lt;&lt;parseGrammar grammar_element&gt;&gt;
</code></pre>

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